[raiph]

Then just write it as `f(5, 6);`. That works too.

Tail nesting doesn't need parens, but otherwise you're right, use parens to nest.

As for reading code, rest assured that "buy food" rather than "buy(food)" is something the vast majority of English readers find easy to read, even years later.

That said, if such things make you snap, perhaps it's time to relax and ignore posts about programming languages you don't know. :)